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[2003:d8:2f09:3f00:d228:bd67:7baa:d604]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4290c738e01sm85236555e9.11.2024.08.09.11.06.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Aug 2024 11:06:43 -0700 (PDT) Message-ID: <04d06717-4d44-4e09-a3cb-d8350e3466ad@redhat.com> Date: Fri, 9 Aug 2024 20:06:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/19] mm: Introduce ARCH_SUPPORTS_HUGE_PFNMAP and special bits to pmd/pud To: Peter Xu Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sean Christopherson , Oscar Salvador , Jason Gunthorpe , Axel Rasmussen , linux-arm-kernel@lists.infradead.org, x86@kernel.org, Will Deacon , Gavin Shan , Paolo Bonzini , Zi Yan , Andrew Morton , Catalin Marinas , Ingo Molnar , Alistair Popple , Borislav Petkov , Thomas Gleixner , kvm@vger.kernel.org, Dave Hansen , Alex Williamson , Yan Zhao References: <20240809160909.1023470-1-peterx@redhat.com> <20240809160909.1023470-2-peterx@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: D4B6F20019 X-Rspamd-Server: rspam01 X-Stat-Signature: no3h48tskxtayzu6fuuq6nrnh3ukjz7g X-HE-Tag: 1723226809-610795 X-HE-Meta: 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 DXar6pgR wiVvBM3LLZ0Ypw4jIqtpsbU+lZu9zKBulnfB18UcVjh1Pvw2FSDMq9Qxe/0NUK2Wki80ZlNWXu6ghgXvirIcrLjbygbVR3BgilvHjlkVJgpQxRrvz+t4j69E/srqqHUzgwZ+At7o8e68WXinVbdq/8UPh553SkA/1zT6xQxjJfNIV5fNelenerdP7QNrnkBjnhUf39wA2PoV5SQji13gy7v2i8jYIzJGC6mfj02IcS3O+ja996c2hyRQAfoHhUvaOmkl8m4lAN4ir5jEpot9+uKFs08Vhv+yX6AHTun59LtOBw2AIPCT5w9ydNEQ+ruGQXR3uKjQTAI4QXo5Y2HS0sTXg/ZRpQeJR3Noks1k4jdKzWkAE0DBzg89srLY73+FDed9GzWuz8gUBhzjPMwpnm+7sbIqEcYKmNgCMq4eahTRbL9m/Bgx5rNTZUN5BFh0O0oMS X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 09.08.24 19:16, Peter Xu wrote: > On Fri, Aug 09, 2024 at 06:34:15PM +0200, David Hildenbrand wrote: >> On 09.08.24 18:08, Peter Xu wrote: >>> This patch introduces the option to introduce special pte bit into >>> pmd/puds. Archs can start to define pmd_special / pud_special when >>> supported by selecting the new option. Per-arch support will be added >>> later. >>> >>> Before that, create fallbacks for these helpers so that they are always >>> available. >>> >>> Signed-off-by: Peter Xu >>> --- >>> include/linux/mm.h | 24 ++++++++++++++++++++++++ >>> mm/Kconfig | 13 +++++++++++++ >>> 2 files changed, 37 insertions(+) >>> >>> diff --git a/include/linux/mm.h b/include/linux/mm.h >>> index 43b40334e9b2..90ca84200800 100644 >>> --- a/include/linux/mm.h >>> +++ b/include/linux/mm.h >>> @@ -2644,6 +2644,30 @@ static inline pte_t pte_mkspecial(pte_t pte) >>> } >>> #endif >>> +#ifndef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP >>> +static inline bool pmd_special(pmd_t pmd) >>> +{ >>> + return false; >>> +} >>> + >>> +static inline pmd_t pmd_mkspecial(pmd_t pmd) >>> +{ >>> + return pmd; >>> +} >>> +#endif /* CONFIG_ARCH_SUPPORTS_PMD_PFNMAP */ >>> + >>> +#ifndef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP >>> +static inline bool pud_special(pud_t pud) >>> +{ >>> + return false; >>> +} >>> + >>> +static inline pud_t pud_mkspecial(pud_t pud) >>> +{ >>> + return pud; >>> +} >>> +#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */ >>> + >>> #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP >>> static inline int pte_devmap(pte_t pte) >>> { >>> diff --git a/mm/Kconfig b/mm/Kconfig >>> index 3936fe4d26d9..3db0eebb53e2 100644 >>> --- a/mm/Kconfig >>> +++ b/mm/Kconfig >>> @@ -881,6 +881,19 @@ endif # TRANSPARENT_HUGEPAGE >>> config PGTABLE_HAS_HUGE_LEAVES >>> def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE >>> +# TODO: Allow to be enabled without THP >>> +config ARCH_SUPPORTS_HUGE_PFNMAP >>> + def_bool n >>> + depends on TRANSPARENT_HUGEPAGE >>> + >>> +config ARCH_SUPPORTS_PMD_PFNMAP >>> + def_bool y >>> + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE >>> + >>> +config ARCH_SUPPORTS_PUD_PFNMAP >>> + def_bool y >>> + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD >>> + >>> # >>> # UP and nommu archs use km based percpu allocator >>> # >> >> As noted in reply to other patches, I think you have to take care of >> vm_normal_page_pmd() [if not done in another patch I am missing] and likely >> you want to introduce vm_normal_page_pud(). > > So far this patch may not have direct involvement with vm_normal_page_pud() > yet? Anyway, let's keep the discussion there, then we'll know how to move > on. vm_normal_page_pud() might make sense as of today already, primarily to wrap the pud_devmap() stuff (maybe that is gone soon, who knows). Anyhow, I can send a patch to add that as well. -- Cheers, David / dhildenb